土壤对磷的吸附与解吸及需磷量探讨

STUDY ON THE ADSORPTION AND DESORPTION OF PHOSPHORUS IN SOILS AND PHOSPHORUS REQUIREMENT

摘要: 本文探讨了不同质地土壤对磷的吸附与解吸。根据Langmuir方程式求出不同土壤对磷的最大吸附量。影响磷吸附的土壤理化性质主要为粘粒含量、碳酸盐含量和有效磷含量。以Freundhich方程式X=acb中的c值为每克土中含P0.2g时而计算出的X量可做为施磷量的依据。

Abstract: In this paper, the adsorption and desorption of phosphorus in the different textuie soils were studied. The maximum amount of P adsorption (Xmax) was obtained from the Langmuir equation. The main chemical and physical properties, which affecting adsorption of P were clay content, CaCO3 content and available P content in soil. Phosphorus requrement (X) was calculated from the Freundlich equation X-acb by the value of C at 0. 2ug/g P.